WSDOT Sr 509 Phase I Alignment Noise Barrier Analysis Summary (wall 3 4)

Not calculate as receptor is too far from active highway. 66.3 dBA Not calculated - abatement failed feasible criteria. Barrier Analysis showed insertion loss of 5 dB not possible. Only Impacted Receptors Reported Barrier Analysis - Abatement FAIL - - - - - - Barrier failed feasible criteria, further analysis not performed. Analyzed Wall 4 Predicted Sound Levels 0869650340 63 dBA Not calculate as receptor is too far from active highway. 66.6 dBA 61.6 dBA 0869650330 63 dBA Not calculate as receptor is too far from active highway. 66.1 dBA 58.9 dBA Only Impacted Receptors Reported Barrier Analysis - Abatement Yes 2080 Yes 2160 $111,478 $72,254 FAIL: Wall cost higher than allowance. Barrier Failed Reasonable Criteria Feasible Criteria Reasonable Criteria Majority of 1st row receptors receive 5 dB insertion loss? Wall Area (sqft) Majority of 1st row receptors receive 5 dB insertion loss, and one with 7 dB? Wall Area (sqft) Wall Cost Wall Allowance Reasonable? Wall Allowance Reasonable? Reasonable Criteria Impacted Receptor (KC Parcel ID) Existing Sound Level (2015) No Build Sound Level (2045) Build Sound Level (2045) Build Sound Level with Abatement (2045) Build Sound Level with Abatement (2045) Feasible Criteria Majority of 1st row receptors receive 5 dB insertion loss? Wall Area (sqft) Majority of 1st row receptors receive 5 dB insertion loss, and one with 7 dB? Wall Area (sqft) Wall Cost Impacted Receptor (KC Parcel ID) Existing Sound Level (2015) No Build Sound Level (2045) Build Sound Level (2045) drews Callout Build sound level w/…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]